Peritoneal cancer is difficult to treat and has a poor survival prognosis. But a new and effective nanomedicine delivery system is offering some hope.
The company is called NaDeNo and is well underway with the development of a new cure for cancers that have spread to the peritoneal cavity. It is a spin-off from SINTEF, where the technology was developed over a period of more than ten years within nanomedicine research.
The work from which NaDeNo has evolved started in 2012. Initial research at SINTEF yielded promising results, and now both the technology and its patents are being spun off from the research institute and into a separate company.
The technology makes it possible to embed large volumes of an active cancer drug in nanoparticle carriers. These carriers are then injected into the peritoneal cavity, enabling the drug to be evenly distributed and thus delivered to all the tumors developed in the peritoneum.
Delivering a large dose, the tumors
Experiments using mice and rats demonstrate that the nanoparticles accumulate preferentially in the tumors, thus releasing a much greater proportion of the drug to cancer cells than they do to healthy cells.
“A solid foundation created by research carried out at SINTEF has enabled progress within the development of this technology”, says Ýrr Mørch, Chief Technology Officer (CTO) and co-founder at NaDeNo. “If we get the results we’re hoping for, the technology may represent a significant step forward, not only for the future treatment of peritoneal cancer, but also for other illnesses”, he says.
However, in order to make the technology accessible to cancer patients, it first has to be tested thoroughly and then manufactured at larger scales. It must be both safe and effective.
“We’re now getting ready to start pre-clinical trials”, says Mørch. “This phase will take some years, during which we will carry out several animal studies using standardized methods. We must test the product thoroughly and demonstrate that the drug is safe and can be manufactured with appropriate medical purity”, he says.
“The human body is composed mostly of water. Drugs that are poorly soluble in water are thus difficult to transport to the correct location in the body in sufficient doses to enable them to work for long enough to have their full effect without causing serious side effects.
The company will then apply to carry out clinical trials on cancer patients.
“Nanoparticles are now being manufactured at laboratory scale at SINTEF, but we have to show that we can produce these at an industrial scale”, says Mørch. “This must be carried out by specialist manufacturers, but to do this we have to go overseas”, he says. “A lot of research remains to be completed before the technology can be applied on cancer patients. We are still at an early phase”, he says.
Results from experiments on a variety of tumors in mice have shown that just one injection of the new drug was sufficient to remove a targeted tumor.
Difficult to treat peritoneal cancer.
Peritoneal cancer is difficult to discover and to treat. It often arises as a result of the spread of cancer cells from other organs such as the ovaries or digestive tract. It gives few symptoms and is often discovered too late. Survival prognoses are usually poor.
Current treatment approaches are yet to be standardized, and they tend to be life-extending rather than curative.
Patients who get this diagnosis are commonly treated by surgical removal of all visible cancer tissue followed by chemotherapy that is administered either locally, or to the entire body via the blood. The problem with this approach is that the drug either has too short residence time in the peritoneal cavity or fails to reach the cavity and the cancer cells.
“This is due to a barrier that exists between the blood and the peritoneum”, says Annbjørg Falck, who is CEO and co-founder of NaDeNo.
In order for the drug to work effectively it has to be soluble in water. However, many chemotherapeutic treatments involve small-molecule drugs that are poorly soluble in water. Such treatments are thus difficult to deliver targeted at tumor sites.
Small particles with an enormous surface area
NaDeNo is aiming to address this by encapsulating the drug in tiny nanoparticle carriers. The nanoparticles are injected directly into the peritoneal cavity in a solution that ensures that they are distributed uniformly and reach all the tumors in the peritoneum. They then release the drug at the tumor sites.
“This drug is poorly soluble in water when it is ‘naked’ but becomes highly soluble when embedded in the nano capsules developed by SINTEF”, says Mørch. “The capsules help the drug to reach the correct location. When the particles degrade in the body the drug is released”, she says.
Cabazitaxel is very powerful and exhibits less resistance development than other comparable cytotoxins. A new and optimized delivery method will thus enable many more patients to benefit from this effective drug.
In experiments with mice and rats, the researchers have observed that the nanoparticles accumulate in the tumors located in the peritoneum. This enables a greater proportion of the drug to reach the cancer cells and less is wasted on the healthy cells.
“The uniform distribution of the drug throughout the peritoneal cavity, combined with the longer residence time, demonstrates that the animals appear to tolerate the drug better when this delivery system is used”, says Mørch.
There are also other benefits.
“The size of the nanoparticles means that they have a large surface area in relation to their volume”, he says. “As many as 10¹² particles are contained in every milliliter of solution – literally billions of particles. This makes an enormous surface area available for interaction between the particles and their surroundings, and not least for attachment to the various cells and tissues in the human body”, says Mørch.
This enables the nanoparticles to deliver large amounts of the drug to the tumors.
An effective anti-cancer cytotoxin
The product currently being developed by NaDeNo can thus be described as a nanotechnological platform for the encapsulation of non-water soluble (hydrophobic) drugs in nanoparticle carriers. There is currently great demand for the effective delivery of such drugs.
“If we succeed with our first product, it will enable us to offer a delivery technology that can benefit companies in both the pharmaceutical and biotechnology sectors”, says Mørch.
The cytotoxin that the company is using is called cabazitaxel. It is very effective, but current methods of delivery also cause major side effects.
“Cabazitaxel is currently used only for the treatment of prostate cancer”, says Annbjørg Falck. “The active component is highly toxic and is poorly soluble in water. For this reason, there are limits on how much of the drug can be administered without causing serious side effects”, she says.
The poor water solubility of cabazitaxel makes it difficult to develop nanoparticle delivery systems for the drug. NaDeNo thus must demonstrate that embedding the drug in nanoparticles offers better efficacy compared to current treatments for patients suffering from cancer metastasis to the peritoneal cavity.
“Cabazitaxel is very powerful and exhibits less resistance development than other comparable cytotoxins”, says Falck. “A new and optimized delivery method will thus enable many more patients to benefit from this effective drug”, she says.
By Silje Grytli Tveten